Fluid meter



H. L. BLUM FLUID METER Dec. 9, 1941;.

Filed Dec.

6, 1937 4 Sheets- Sheet 1 mm mm mm WIBJM/m INVENTOR.

- ATTORNEY.

H. L; BLUM Dec. 9, 1941. 4

FLUID METER Filed Dec. 6', 1937 4 Sheets- -Sheet. 2

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FLUID METER Filed Dec. s, 1957 4 Sheets-Sheet 5 I I 279215217281 .iZ

latented Dec. 9, 1941 UNITED STATES= PATENT- OFFICE 8 Claims.

This invention relates to an improved fuel meter and has for one of its principal objects a-' provision of means for measuring the flow of liquid fuels in a more accurate manner thanhas heretofore been considered possible.

This application is an improvement-over the device disclosed in my application Serial Number 118,489, filed December 31, 1936, for Fluid meters.

One of the important objects of this invention is to provide a liquid flow meter particularly adapted for use in measuring fluids such as fuels which is so constructed that it will accuratelymeasure the amount of fluid passing therethrough regardless of the rate of flow.

Various attempts have been made to produce meters which are adapted for measuring-small flows of liquid passing to equipment in which the liquid is handled or consumed. A specific instance of a meter of this type is one which is used for measuring the flow of fuel to internal combustion engines such as are used in automotive, marine and aeronautic work and in some classes of stationary work.

The use of meters to measure the amount of fuel consumed is desired in some cases to determine the most economic methods of operation of the engine; in other cases it is desired to main tain a constant check upon the state of repair of the engine by checking its efliciency; and in other cases it is desired to insure accuracy of the records pertaining to the operationof the engine especially where there are various units in'service. Other benefits and applications are readily apparent apart from those which are recited above by way of illustration.

The minimium rate of flow of fuel in an ordinary gasoline consuming automobile truck engine is quoted by manufacturers of such vehicles as being approximately a quart an hour when the engine is idling. This flow must be delivered with reasonable accuracy if the meter is to perform the functions outlined in the preceding paragraph. The severity of this requirement can be appreciated when it is noted that the minimum rate of flow which can be measured with reasonable accuracy by commercial meters now on the market is sixty quarts an hour, or sixty times as fast as the permissible minimum rate of flow in the class of work under consideration.

The liquid pressures available in the installations contemplated above vary from one half to perhaps four pounds; consequently, the, head loss through the meter must be minimized to prevent any interference with the operation of the apparatus to which the meter is applied; The-head loss must'also beheld to a minimumto reduce slippage of fluid past the measuring mechanismand to prevent-undue frictional resistance'to motion in the valve parts. It will be appreciated thatslippage would cause-a considerably greater percentage-of inaccuracy in meters operating-at slow rates of flow than in those-operating'at greater rates of flow.

A meter which is designed for the'purposes set forth above must in many cases operate under conditions of severe vibration and in every conceivable position. It is therefore" a matter of strict necessity that the'parts be snugly fitted. Itis further impractical on this-account to use floats'or gravity type measuring chambers.

It should be appreciated that to accurately'perform the task of measuring liquids under conditions, some of which are pointed out above, a

meter must be a refined instrument. In other words the ability to perform will dependto a considerable extent upon the refinements incorporated in it.

One of the objects ofmy invention is to provide a liquid meterwhich is adaptedfor accurate.

operation under low pressures and at low rates of flow.

Anotherobject of my invention is to provide beris stressed duringa strokeof the'measuring means and in which-the valve is restrained against motion until the stroke of the measuring means is substantially completed.

Still another object of my invention is to provide a freely operatingliquid meter having a quick acting valve mechanism in which the 'pressure on the valve is reduced to a minimum.

Other objects will become apparent from a" study of the description and the accompanying drawings in which:

Figure '1 is an elevation with parts broken away showing the meter and one form of the balanced valve.

Figure 2 is a sectional view taken on the line 2-2 of Figure 4 showing the .piston structure and cylinders in assembledrelation with the body member.

Figure 7 is an elevation partly in section show ing a, modified form of a piston unit having pro vision for adjustment.

Figure 8 is an elevation showing an elfifitrie registering mechanism adapted for use with the meter instead of the registering mechanism of;

Figure 4.

Figure 9 is an elevation of another fOrm'oi a r m h n m adap d.- r s w h t met r instead. of the valvermechanism shown Figures 1 and- 3. V Y

Figure; 10 isan; exploded view of; the. valve of gur Y I F gu e 1 .1 1 Vie hQWm a JWfifid por ran em nt Q 'a-.-;m; num m'o Qn ale. nc d e and-.ma m mp area.

Figure 12 is a sectional view, taken on; I2 -+l2 of Figurell. I V H Figure 13 is a plan. view of th valveseat and ports of the modification shown, in, F g re 11.

the line Figure 14 is, a perspective View of the valye ele ment used'with "the mechanism of Figure 10.

Figure 15 is'a perspective View of the valve ele- J i3 which. extends entirelythroughv the-body pera ment used with the mechanism 'ofFigure 3.

ai..downwardly extending conduit 6i.

stantially circular boss 49 which is disposed midway between the flanges I3 on the body. The valve seat is disposed in a plane which extends substantially perpendicularly to the planes of the flanges.

A flange 5i is formed in radial spaced relation about the boss 49 and is provided with outwardly projecting ears 53 which are provided with threaded openings 55 adapted to receive screws which, retain the, valve chamber cap. 51 (Figure 4) in place.

The flange 5| merges with an upwardly extending boss 59 which lies behind the plane of the Valve seat (Figure 4) and which i provided with The conduit. is deflected. from its downwardly course into a horizontal 'one which terminates in a port 63 Referring'to Figures. 1 and 2; the numeral i l indicates thecentral body member of the meter which forms the nucleus about which all of the other elements wihch' form the meter areassembled and 'upon' which they are mounted; The

bodyis preferably diejcast and is'machined' to receive the above referred to elements As shown in Figure 2, the body is provided-with ,radial flanges l3- and counterbored at15-to receive the finishedguide portions "I 1- oft-he cylindersl5. The-cylinders are preferably die castand provided with flanges 2| which extend radially and-- substantially parallel with flanges -l 3. Perforations- I 2: in-the cylinder -flanges-- are disposedinalignment with..tappedholes the. flanges N B and cap screws-23 .holdthe-finishew radial. surfaces 25; and. 21 .0f.- the flanges. 21 and.

I3 respectively in sealing relation with a gasket.

29 which maybe. of... cork or any other suitable gasket, materiali.

Thecylinder: castings arebored 311L311 toiprovid el ooth. wal e cy nders. which. erect,- uniform diameter hrou hout their .1engtns, .and the. dim t s of h y nde s; ar heldto e ynlose limits of tolerance. Rein-forcing ribs 7 33% are formed n e ut su a esti tasti e nd a rib 35 of substantial width and thickness;

formed on each casting is cored longitudinally to form 'a ,fluid conduit 31. which. communicates with I the cylinder through a radiallyco red hole 39 Conduits 31 open into'thefflanges of casti i and emerge from the bodyimember valve ports u (Figur'e 3) in- 'a"valve seat 41 formed'on a subin, the valve seat. Conduit 6| is enlarged at its slower p r io .of. e odyamemb r and: in. sub;-

stanti-al alignment; with; the conduit; 6|

a dis .die te at r ht n les to i s,v ward .rse andr p s i o lv nt he hannel Wtbetween; the boss @Qand, the flange 5|. The lQWerp r- :tion of the channel is, enlarged, and threaded internally at 'H- to receive a standard pipe .connec tion so, that a conduit connected; With a liquid-- supp y or a p p y be at ach d o; c nduct fluid under pressure to-themeter.

The body member is .pro videda with an opening pendicularlyi with respect to the plane of the valve seat and substantially, centrally of thebOSs; 49. This opening passes .througha branchi Q r the: cored. opening '55, which isiormed inthe central; portion of the. body member, and passes through the wall l7. into chamber "79, Whl'Qh-hOllsegapoition of the register operating. mechanism,

That portion of the opening 13. between the ;val ve seat and. the opening 15 is provided with a,

bushing 8! while the portion. between the: wall Ft and; chamber 19 is; counterbored at.- 83. and; threaded to. receive packing 85. and a" packinggland 8.7. which. .threadedly engages the. body-- member. a

Ashaft 89 is mountedfor rotation insaidbush-r ing and stufiing boxandhas fixed to.it,.by means of a jointcomprising slot 9llfand screw. .92; at the end extending into, chamber 19, a depending pawl carrier to which is. pil otallyattached; by,- means of aheadedpin, 53,,apawl 95. Aspaceir} 9?! maintains the pawl in,v spacedv relation to the ear .v rier and afspring 99; encircles the pinand engages; h pa l nd a riersolasto bias the former. is:

I clockwis rotation (Figurefi) about. the pin.

A st ndicated en rally by t e-nu rallll'l comprises cun erwheels. I 3. mount d. for; free. rotat n. sha t. W5; ch; ismlounted. n. a housing [0].. Transfer trains. connect .thfil.

. counterwheels for operat on, and. compr se Genera sired form of register may be substituted for that just described which is shown merely for the pure pose of illustration. The register housing I81 is open at one end and is held in abutting relation with a finished surface Tom the body member by means of screws or other suitable fastenings which enter the openingsl I8.

A lever I I9 is attached to that portion of shaft 89 which extends through the opening in the body member. The upper end of the lever is broached to receive the shaft and is slotted and fitted with a transverse screw which tends to close the slot and clamp the lever on the shaft. The lower end of lever H9 is provided with an opening which extends parallel with shaft 89 and a pair of rollers I2I are mounted on a shaft I23 which is supported in said opening.

The lever H9 is operated by a piston assembly. A piston rod I25 which is provided with reduced portions forming oppositely facing shoulders I21 near each end. of the rod. Spacer members I29 are mounted on the reduced portions of the rod in abutting relation with respect to the shoulders I21, and. a flange I30 is formed on each member adjacent the shoulder. At the opposite ends of the members are formed flanges I3I which serve both as stops and as supporting members for the piston forming elements which comprise inner spreaders I33 preferably made of metal, inner leathers I35, spacer or supporting discs I31 of metal or of any desired composition material which is capable of forming a stiff backing for the leathers, outer leathers I39, outer spreaders MI and washers I 43. Nuts I are screwed on the threaded ends of the rods to maintain the spacers and the piston forming elements in position against the shoulders I21 on the rods.

Stops M1 are formed integrally with the body member and are positioned to contact the flanges I3I. The latter may be faced or finished as indicated by the numeral M9 to contact squarely the finished surfaces I5.I of stops I41. It will be seen that by accurately maintaining the distance between the finished surfaces I49 and the distance between the finished surfaces I5I of stops I 41, the stroke of the pistons can be accurately regulated.

If desired the piston structure may be modified as shown in Figure 7 to provide for adjustment of the stroke. In this form the piston rod I I25 is of uniform diameter throughout its length and is threaded at each end for a considerable distance to receive internally threaded members 29 which are formed with operating flanges H30, spreader supporting flanges II3I, and finished stop surfaces H 29. Inner spreaders I I33, and leathers H35, spacer discs H31, outer leathers H39 and spreaders II4I, washers H43 and nuts I I45 are assembled on the piston rod in the order mentioned. By screwing the members H29 toward or away from each other and adjusting the 1 nuts II t5 accordingly, the distance between the respective stop surfaces I I49 and the stop surfaces on the body member may be decreased or increased to decrease or increase the Volume displaced by the pistons at each stroke.

Valve mechanism the bushing I53 outwardly of the flange I55 and extends parallel to in the same direction as member.

the lever II9 described above. A pin I59 is fixed with one end in the lower end of lever I51 and is pivoted at its other end in a slot I60 the lever I6I which is in turn pivoted on a pin I63 supported on an angle plate I32. This plate is mounted at each side on a plurality of superimposed spacer sleeves I64 and IE6 and is held in place onsaid sleeves by means of screws I68 which enter the plate and sleeves and engage threaded openings in the flange 5.I of the body member.

A valve actuator plate I65 is mounted for free rotation about the portion of the bushing I53 between the flange I55 and a retaining collar I61. which is fixed to the bushing. The collar I61 spaces the actuator plate above the plane of the valve seat so that liquid may freely enter. the ports 45. The plate is. provided with notches I69 the upper edges I1I of which project beyond the lower edges, to form stops which are adapted to abut the latch pawls later to be described.

An elliptical open ended member I13 having finished end faces forms the valve.

The internal perimeter and form of the valve is such that two adjacent valve ports 63 and 45 may be encompassed by the valve member at one time. This member is loosely received in an opening I 15 in the valve actuator plate I 65. The finishedend faces of the valve member'sealingly engage the valve seat 41 and a balancing plate E11 which is fixed to the body member by means of screws I19 which enter threaded openings I in the body member. Spacers I8I are inserted between the body member and the balancing plate to retain it in proper position above the valve The function of the balancing plate and spacers is to relieve the valve from the pressure of the incoming fluid thus reducing friction between the valve and its seat so that the valve will not stick to the valve seat. Thus free action of the valve is assured.

The upper end of lever I6I is provided at its inner side with a peripherally grooved roll I82 which serves to retain the loop of a spring I83, the ends of which are attached to a ring I84. A pin I 35 is fixed in an upwardly projecting, arm I81 on the valve actuator plate and extends outwardly thereof so that a groove in the outer end of the pin will lie in substantially the same plane as the groove of the roll I82. The groove in this pin supports the ring I84 and maintains the spring I83 under tension.

Two allochiral pawls I89 are .each pivotally mounted reduced shoulders formed on the upper end of the lower spacer sleeves I66. The pawls are provided with perforations I9I between which is mounted a tension spring I which biases the pawls toward the actuator plate I65 and are provided with integral up standing studs I93. The actuator plate and the pawls are disposed in the same plane while lever I51 overlies the pawls so that it will engage the studs I93 at predetermined points in its motion to withdraw the pawls from the notches I69 in the actuator plate.

A mounting lug I 99 is formed on the central body between flanges I3 and substantially in the same plane as the lever II9. An opening MI is formed in the lug to receive a bolt or screw not shown which serves to hold the meter in place on any mount which may be provided.

Operation If we assume.

- clockwise "direction and as thelever that:the pistons have just completed the .leftward :strolre as shown inxFigures 11 and i2 and that :the. valve mechanism .has just snapped uto the :position shownin Figure "l, it will beseen that-the tliquid under inlet pressure will pass through .the left hand port :45, lthrough the left hand :conduit 43 in ::the ;body I and "the conduits 3.1 Land 39 in the left hand cylinder r I 9-1and-:enters the measuring .chamber formed Zbyzthe. left hand piston ,andzthe "boreithe cylinder :.3I. The piston is :forced itoward .the. right and as. a result the-liquid confined in ztheright: hand. measuringrcha-mber .is-forced out through the right hand conduits I39, 31, 43 and port "45 and into the chamber formed. by .the valve H3 and the balancing plate I'll. Since the valve encompasses both .pthe right hand port :45 and discharge port 6:3,liquidwill pass from'ltheiinterior of the -.valve.throughrport 163.andconduit 6| to float chamber-of a carburetor or other -suitable receptacle.

As the pistons approach the rig-htthan'd end of the stroke, the flange I30 of the left hand member 1329 engages rolls I?2.I.-onlever II9 and rotates sai'd ilever and shaft *89 in a :counterclockwise directioniFigures 1-andi 2) The valve operating lever llxwhich is attached 'to shaft 89 is also rotated .in i a I counterclockwise direction and carries withit thelower end of theilever I'B-I which-pivots on its pin"l63 in-a counter- F5'I continues to :rotate, the "distance between the pin I585 and roll I'BZ increases and tensions the spring :I83.

Continue'd rotation of lever I51 will bring its lower end intocontact with the studpin 493' on right hand pawl I89 and the pawl will be rotated in aclockwise direction about its pivot- I 66 against the action of spring I95 which yieldably holds the pawl in engagement with the valve actuator plate. The pawls anddevers comprising the valve operating system are so .designed and proportioned that the pawl will-be disengaged from'the notch I 69 at substantially the-sameinstant-that the stop -surface MQ-ofthe piston element contacts the faceI-SI o'f stop ld'l 1 on the central body member. 1

When the actuator-plate is released by the stop 7 it will'be suddenly rotated in a counter-clockwise direction -on bushing 153 under the *actionyof spring I33 which was tensioned as described above. The rotation of the actuatorp-late is arrested upon engagement of the'proj-ecting shoulder III on the plate With-the left ha-nd -pawl I89 which thereupon enters the left hand notch Hi9 in-the plate under the action of spring I95.

this position ofthe-actuator-plate,-the valve Iiiencompasses the-left hand port 45 and the discharge opening fi3 so. that the =rig-ht hand opening A-lis connected with theinlet pressure in the. chamber under cap 5l. Thustthe direction 'of' the differential of inlet and outletpressures-on the pistons is-reversed and the-piston strokei-n the-leftward directionis begun and-continues untiLthe spring Ii8'3iis again stressed and thele'ft hand pawl is released. Therelease occursat substantially'the instantr the stop surface I49 on-the right-hand piston member -I29 -engages-the stop surface I5I of rightihandastopmember I 41 on the body member and thev associated parts again assume their original positions as shown in Figures 1, 2, and 3 and thecycle is repeated. 7

Referring to Figure 6,-it w-ill be seen that th pawl ca-rrier 9I wh-ich is attached to shaft8-9 will completeone cycle of operation at the same time Genevargear and spur pinion II.I, H2 which 'is mounted for free .rotation on'a shaft 1 I3. The spur pinion isenmeshed with a spur .gear '4 attachedxtoithe-unitsdial. The'ratio oi'the gearing is suchthat one revolution of the tenths dial advancesivthei-units dial one step. Similar-transfer mecham'smsconnect adjacent higher order dials. The dials I103 and ratchet II=5 are'mounted for 'f-reesrotationabout a: shaft I05 whichis supported in a'register case I'B'I. The register dials are visible through: a window I08 in the casing.

It is obvious that any desirable register may beprovide'd in the place of that shown and'that the ratio of the transfer gearing maybe varied without the exercise 0f invention. Similarlyflt is obvious that :any suitable ratchet mechanism may 'be. substituted for the single acting ratchet mechanism 'described in the event'that it is desired to register-the flow in increments of different-magnitudes than those-disclosed. 'Applicant-does not therefore-desireto be limited to the specific mechanisms here 'disclosed for the purpose of illustrating-the principle of hisiinvention.

Modified .palve structure -A:modified;form "of valve is'disclosed inlFi ures.9 sand :10 linawhich the valve'seat 41 and flange5l .arecthetsame as thatdisclosed in -Figures Land 3. The -valveactuator plate 290.is mounted ':for pivotalmotion on the bushing I53 of, ;shaft:-- 892. and is provided with an opening 1-21 I infwhichistloosely; fitted ;-the valve205 Figure 14. The .valve comprises an .telongated-body having an .elongatedi'recess .of sufiicient length to encompass a .pair::of;adjac ent valve ports fia .and 45 formed inthevalveseat.

.A projection :2'l5 Jis formed-on the actuator platesand apini-2 I1? is fixed in said projection to extend substantially perpendicular to the plane of the plate. The lower edge'2l'9 of the actuator plate'iis formed straight anda spring plate =22I having a bent over 'edgei'222 which: abuts the edge 2W .isflflied'to' the actuatorxplate by a rivet 225. An-openingJ226-2is :formed in the-springplate of sumcient sizesto: clear the' fiange I 55 on the bushing I 53.

of spacer; sleeves 232 and-are held in placeby upper spacer sleeves 233- which 'in'turn are held fast by screws 231 which are supported in. holes in flange "-5I. An angle plate235is supported The spring plate extends over the valve 205 and is bent slightly towar'd it so as to bear between the upper spacer sleeves 233 and the heads of screws 23! in spaced relation with respect to valve seat. An opening 231 is formed at the apex of the angle plate and a double armed roll bearing lever 239 is pivotally mounted at its center on a pin 240 which is supported in said opening.

One arm of the lever 239 has pivotally mounted thereon a grooved roller 24| while the other end is provided with a slot 243 which extends axially of the lever and is adapted to receive the pin 229 on lever 221.

Notches 245 are formed in opposite edges of the actuator plate and are adapted to alternately receive the pawls 209 when the recess of valve 205 encompasses port 63 and one or the other of ports 45. The upper edges of the notches project outwardly to provide stop means 201 which are adapted to engage the pawls to limit the angular motion of the valve actuator plate.

A spring 249 is fixed with its ends in openings 25L one in each pawl 209 and serves to hold the pawls in engagement with the edge of the valve actuator plate. The lever 221 is of sufficient length to engage pins 252 which are fixed, one in each pawl 209 and serves to move the pawls from their positions in the notches in the actuator plate upon rocking movement of the lever 221.

The ends of a spring 253 are fixed to a ring 255 which is supported by the pin 211 while the central portion of the spring is looped about the grooved roll 24L Operation of modified valve mechanism As the pistons move in a right hand direction Figure 2, the shaft 89 will be given a counterclockwise rotation which is transmitted to lever 221. The valve actuator plate is held in the position of Figure 9 by the engagement of right hand pawl 209 and its corresponding notch 245 so that the valve recess 2i3 will encompass port 63 and right hand port 45 to permit the right hand cylinder to discharge and the left hand one to fill.

The counter-clockwise rotation of lever 221 is transmitted to lever 239 by the pin and slot connection 229243 and as roll 24l passes the cen terline drawn between pin 241 on the actuator plate and the pivot 240 of lever 239, the spring 253 will be stressed and will bias the actuator plate for rotation in a counter-clockwise direction. This rotation is prevented by the engagement of right hand pawl 209 and notch 245.

Lever 221 will eventually contact right hand pin 252, and the parts are so designed that just as the stop face I49 on spacer member I29 (Figure 2) contacts the face 15! of stop 141. the pawl 209 will be withdrawn from its notch 245 in the valve actuator plate and said plate will rotate to its counter-clockwise position which is determined by the contact of projecting shoulder 201 with left hand pawl 209 which thereupon is forced into the corresponding notch 245 by spring 249.

The recess in the valve 205 is thus shifted to encompass port 63 and left hand port 45 so that the left hand cylinder will discharge while the opposite cylinder will fill. As a result the levers 221 and 239 now will be moved in a clockwise direction to bias the valve plate for motion in a clockwise .direction and to release the left hand I pawl 209 at the end of the piston stroke so that the valve will be moved to its original position as shown in Figure 10 by spring 253 to complete the cycle.

Electric indicator control In some cases it is desirable to control a register located at a distance from the meter. Such a register is usually intermittently operated by a solenoid which is energised at the end of the delivery of a unit quantity of fluid by the meter. To control such a register, a make and break mechanism such as that shown in Figure 8 may be substituted for the register mechanism l0l shown in Figure 4 by removing the screws from holes I I8, removing the register housing I01, removing arm 9l, placing a coupling on shaft 89 and screwing the case 345 into the body I I by inserting screws in the openings 341.

A case 345 is held in place on the central body ll by means of screws received in openings 341 in the case. In the case is mounted a switch indicated generally by the numeral 349 which may be of the type shown in the" Patent Number 1,960,020 to McGall it being understood that any other suitable switch may be used if desired, and that the particular switch is shown only for purposes of illustration.

A rocker arm 35! is pivotally mounted on a screw 353 which is fixedly attached to the case. The rocker has fixed to it by rivets or other suitable fastenings a spring member 355 which carries a tappet 351 disposed above the switch actuator 359. The other end 30! of the spring is bent to engage the casing and serves to retain the rocker arm in its fartherest clockwise position.

A lever 353 is attached to the end of a shaft 364 which is connected by any suitable means so as to be oscillated by the valve actuating shaft 89. The lever 363 is provided with a roller 365 which is adapted to engage the rocker arm and depress it as the lever moves from one dotted line position (Figure 8) to another through the full line position shown. Thus two operations of the switch will be effected during a complete two stroke cycle of the pistons.

If only a single actuation of the switch is desired during a cycle, the lever may be so attached to the shaft 346 that it will occupy the full line position of Figure 8 at the end instead of in the middle of a stroke of the pistons.

The switch is connected to the solenoid (not shown) of the register 301 by a wire 369 and to one side of a source of power by the wire 31l. Another lead 313 connects the solenoid to the other side of the source of power or to a ground to complete the circuit.

travel valve mechanism It is desirable to reduce the amount of valve travel to a minimum to minimize shock in stopping the moving parts of the valve mechanism and to reduce to a minimum the time necessary to effect a valve actuation.

To reduce such travel to a minimum, the valve may be formed as a hollow cylinder 215 as shown in Figures 11 and 12. The outlet port 211 is disposed centrally of the cylinder ports 219 and 28l and sealing walls 283 and 205 separate the ports and are substantially the same width as the valve walls. The walls 293 and 285 are so disposed that they divide the circular area of the valve into two equal parts (Figure 13) thus making ports 211, 219 and 28! of substantially equal area. The shifting motion of the valve to reverse the flow in the meter is only that necessary to cut ofi the one cylinder port from connection with the outlet port 211 at the same time that the other cylinder port is being connected with it. While, for an instant, all three ports may be connected totheform'shownun Figure'3. The upper'por= tion; ofthe valve may beclosed'however if this is desirediand' thespring 221 of Figure may be usedtherewith.

Itiis'. obvious. that numerous changes. may .be made in the form construction and arrangement of partslwithout vd'epartingifrom the spirit of the invention andvfor this reasoniapplicant does not desire to be limited to the specific. forms of mechanisms disclosed; but rather to' such forms; as mayfalrfairly withinthe scope' of? the appended claims.

Whatapphcant considerstobenew and desires to protectbyLetters Patent .ofitheUnited States 1. In. aliquidmeter having'an inlet' for unmeasured liquid and arroutlet'for measured liquid, measuring means comprising reciprocable displacement. means; a valve chamber connected with said inlet; a: planar valve seat in said chame be'r", conduits. for. connecting said measuring meansan'd said'outlet with portsrin said valve seat; a slide valve actuable to different positions on.saidfseat with respect to said ports for controlling'the passage of liquid through said conduits; ,meansior' actuating said. valve comprising an element disposed for actuation by said displacement meansa lever. system connected for operation b'y said element, an actuator provided withanopening ofsulo'stantially the same size as the valve torreuy; carry, said valve, means for mounting said actuator in said chamber substantially pamuemo and spaced'from said valveseat and yieldable means connecting said. actuator with said'leversyste'mb 2. Insaliquidmeter having an inlet for unmeasuredflliquid' andan .outlet -for measured liq? ui'd; measuring ,1 means comprising reciproc'able displacementimeans, a valve chamber connected with said inlet; a planar valve seat'in' said chamber, conduits for connecting, said measuring means. and" said outlet with ports in said valve seat, aslidevalveactuable to difierent positions onisaid'seatl with respect to said-ports forcontrolling the. passage ofJliquid through said conduits, means for actuatingsaid valve comprising an element disposed for actuation by said displacement means,a.lever. system connected for operation by said element, an actuator provided with.-an .opening-.-of substantially the same size as the-valv torfreelycarry said valve; means for mounting, said actuator in-.-saidchamber substantially'parallelvtoand spacedfrom said valve seat, actuator holding pawls;xmeans mounting said pawls ior movement .to and from engaging relationlwith said-aetuator, yieldable means mountedIto-urge said pawls into actuator engaging 're-- lation; saidlever system comprising means for alternately/releasing said holding pawlsas the alternate strolcesot said displacemenhmeans are completed;

3:- I-n a:liquid"- meter having aninlet-for unmeasuredliquidand. an outlet for measured liquid; measuring-meanscomprising reciprocable displacement means; a valve Y chamber connected withisaid' inlet, astationary'planar valve seat in said. chamber; fixed conduits for connecting said measuring meansrand -said outlet'with ports in said" valve seat; a. slide valv actuableto difierent predetermined positions on--. said 7 seat with respect to. said ports for controlling, the passage oiliquid through saidiconduits, means for aotus ating said valve comprising an element disposed foractuation by said displacement means, a-lever systemconnectedfor operationeby said. element; an actuator for said valve, means mounting said actuator in said chamber for movement substan-v tially parallel with said'seat, releasable holding means-effective alternately; to'retain said valve in said predetermined positions, means actuable with said leversystem for releasingsaid effective holding means at the ends of the strokes of-said displacementv means, said actuator being provided with anopening to receive saidvalve, said valve being freely. movablein said actuator to.- ward and from said seat.but constrainedlby said actuatoragainst movement parallel to said seat, and yieldable means connecting. said. actuator with said leversystem.

4. In a liquid'meterfhaving'. an. inletfor un= measured liquid and an outletfor measured'liquid, measuring means comprising. reciproca-ble displacement means, .a valve chamber connected with said inlet, a-stationary planar valve seat in said chamber, ,fixed conduits .for connecting said measuring means andsaid'outlet with ports in said'valve seat, a slide valve actuable to. different positions on saidseat' with-respect to said ports for. controlling the passage ofliquid through said conduits, means for actuatingv saidvalve comprising an element disposed for actuation by said displacement means, alever system connected for operation by said element, an actuator for said valve, means mounting. said .actuatori-n said chamber for movement'substantially parallel with said seat, resilient meansfor. connecting said lever system to drive said actuator, said actuator being providedwith an opening to. receive saidvalve, said valve beingfreely, movable. insaid actuator toward and from said' seatl'but. cons-trainedby said actuator against movement parallel. to. said seat, yieldaole means. mounted toourge' saidvalve lightlyv toward said seat, and means releasable at the ends of L the strokes of said displacement means forholding said valve in one or the" other of its. positions.

5. In aliquid" meter hayingan inletfor. unmeasured li'quidand. an outlet formeasu'r'ed' lid: uid, measuring means. comprising recipro'cable isplacement means, a valve'chamber' connected with said inlet; a planar valve seat in sa'id'charnb'er, conduits for connecting said measuring means and saidoutlet" with ports in said valve seat; a slide valve actuable-"to' different 'positicns on said seat with respect't'd said ports'ior'con trolling the passage o'f liquid through saidco'nduits', means'for actuating's'aid valve comprising an element disposedifo'r" actuation by said' di's= placement means, a lever system' connected for operation by saidielement, an actuator provided with an opening iof" substantially the sam'e' size' the' 'va1v'e to-freelycarry said v'alve; means? for mountingsaidactua'tor'' in" said chamber-i sub= stanti'ally'parallel to"and' spaced'f-rom said val've seat, said lever system comprising a" lever pro: vided with aspring support; a-springa-supporiron said actuator, and-a? helical sprin'galooped about one of'said supports and anchored on the-other uid, measuring means. comprising reciprocable displacement means. avalve chamberconnected with said inlet-,ra. stationary planar valve seat in: said. chamber; fixed conduits for. connecting said measuring means and said outlet with ports.

in said valve seat, a shaft extending substantially perpendicularly with respect to the plane of said valve seat, said ports being radially equidistantly spaced from said shaft, an actuator mounted for rotation about the axis of the shaft in closely spaced parallel relation with respect to the plane of said seat, an opening in said actuator adapted to loosely receive and control said valve, a lever system connected to be actuated by said displacement means'through said shaft and resilient means for connecting said lever system to actuate said actuator.

'7. In a liquid meter having an inlet for unmeasured liquid and an outlet for measured liquid, measuring means comprising reciprocable displacement means, a valve chamber connected with said inlet, a valve seat in said chamber, conduits for connecting said measuring means and said outlet with ports in said valve seat, a valve having a seat engaging surface, actuable to different positions on said seat with respect to said ports for controlling the passage of liquid through said conduits, a pressure balancing member provided with a surface parallel to and in spaced relation with said seat, said valve being provided with a second surface which is adapted to sealingly engage the surface of said pressure balancing member, an actuator mounted for movement in parallel spaced relation with respect to said seat and said pressure balancing member, said actuator being provided with an opening of substantially the same size as the valve adapted to freely receive said valve, said valve and actuator having free relative motion toward and from said valve seat but moving together in a direction parallel to said seat, and means for transmitting motion from said displacement means to said actuator.

8. In a fluid meter, measuring means comprising a reciprocable piston, a source of fluid under pressure, conduits for admitting fluid under pressure to said measuring means, an outlet conduit, a valve seat, said conduits terminating in ports of equal area in said valve seat, said ports being formed to provide continuous seat portions of equal circular outline about any two adjacent ports, a circular valve, an actuator for said valve mounted for movement parallel to and in spaced relation with said seat to predetermined positions, said continuous seat portions being disposed to coincide with said valve when said actuator occupies its predetermined positions, and means for transmitting movement from said measuring means to said actuator. V

HOSMER L. BLUM. 

